Honestly that’s all I do as well using keynote/ppt. But it requires that you’d deliver that in a presentation. I’m fortunate enough to have the opportunity to present this type of information which means I don’t have to spend much time documenting in any official way. I know there will always be use cases for documenting info like this but it’s important to remember it’s just a tool to get you to better solutions. So I think it’s good to make sure the amount of time you spend documenting is weighed against time spent actually designing the product.